Diagnosis Apparatus, Diagnosis System, and Diagnosis Method

1. A diagnosis apparatus comprising: a storage that stores instructions; and a processor programmed to execute the instructions so as to: acquire a detection value of first equipment mounted in a first vehicle and an appropriate value of the detection value of the first equipment; compare the detection value of the first equipment with the appropriate value of the detection value of the first equipment to calculate a confidence coefficient of the first equipment; estimate an appropriate value of a detection value of second equipment mounted in at least one second vehicle within a predetermined range from the first vehicle based on the confidence coefficient of the first equipment and the detection value of the first equipment; and compare the detection value of the second equipment with the appropriate value of the detection value of the second equipment to perform a diagnosis of an operation state of the second equipment.

2. The diagnosis apparatus according to claim 1 , wherein: the processor is further programmed to acquire positional information at a time of detection of the detection value of the first equipment and at the time of calculation of the appropriate value of the detection value of the first equipment; and the processor is further programmed to estimate the appropriate value of the detection value of the second equipment based on the detection value of the first equipment, the appropriate value of the detection value of the first equipment, the positional information at the time of detection of the detection value of the first equipment, and the positional information at the time of the calculation of the appropriate value of the detection value of the first equipment.

3. The diagnosis apparatus according to claim 1 , wherein the processor is further programmed to, when a number of first vehicles is equal to or less than a threshold, perform the diagnosis.

4. The diagnosis apparatus according to claim 1 , wherein the diagnosis apparatus is positioned outside the first vehicle and the second vehicle.

5. A diagnosis system comprising: a vehicle mounted with a diagnosis apparatus including: a storage that stores instructions; and a processor programmed to execute the instructions so as to: acquire a detection value of first equipment mounted in a first vehicle and an appropriate value of the detection value of the first equipment, compare the detection value of the first equipment with the appropriate value of the detection value of the first equipment to calculate a confidence coefficient of the first equipment; estimate an appropriate value of a detection value of second equipment mounted in at least one second vehicle within a predetermined range from the first vehicle based on the confidence coefficient of the first equipment and the detection value of the first equipment, and compare the detection value of the second equipment with the appropriate value of the detection value of the second equipment to perform a diagnosis of an operation state of the second equipment; and a server configured to perform communication with the vehicle, wherein the processor is programmed to acquire the detection value of the first equipment and the appropriate value of the detection value of the first equipment through vehicle-to-vehicle communication solely when the vehicle fails in communication with the server.

6. A diagnosis method comprising: acquiring a detection value of first equipment mounted in a first vehicle and an appropriate value of the detection value of the first equipment; comparing the detection value of the first equipment with the appropriate value of the detection value of the first equipment to calculate a confidence coefficient of the first equipment; estimating an appropriate value of a detection value of second equipment mounted in at least one second vehicle within a predetermined range from the first vehicle based on the confidence coefficient of the first equipment and the detection value of the first equipment; and comparing the detection value of the second equipment with the appropriate value of the detection value of the second equipment to diagnose an operation state of the second equipment.